Expansion bolt



H. W. PLEISTER AND .I. KARITZKY, EXPANSION BOLT. AP'rucATlon men APR. 2.1921.

l ,41 7 1 98 Pat nted May 23, 1922..

VET" 1 5 '7 /0 '6 i'" 5 m ,2 5 l4 UNITED STATE ArEr HENRY W. PLEISTER,OF WESTEIELD, AND JOHN KARITZKY, O33 GABWOOD, NEW JERSEY, ASSIGNOBS, BYMESNE ASSIGNMENTS, T0 HENRY B. NEVJHALL, O]?

PLAINFIELD, NEW JERSEY.

EXPANSION BOLT.

To all whom it may concern.

Be it known that we, HENRY W. Pnnrs'rnx, a citizen of the United States,residing at Vestfield, in the county of Union and State of New Jersey,and J OHN KARITZKY, a citizen of the United States, residing at Garwood,in the countyof Union and State of New Jersey, have made certain new anduseful Improvements in Expansion Bolts, of which the following is aspecification, taken in connection with the accompanying drawings.

Our invention relates to expansion bolts and more particularly to thecombination of an expansion bolt and an escutcheon plate; and also tothe expansion bolt as a separate article of manufacture.

Our invention further relates to such a combined expansion boltincluding an escutcheon plate that has a maximum grip or hold in theceilin orwall for a given size of expansion. 6111" invention furtherrelates to an expansion, the outer end of which in use is adapted to liesubstantially flush with the surface of the ceiling or wall, or may bemoved slightly back in the hole, and a removable escutcheon plateattached to it.

Our invention further relates to an expansion having a neck providedwith an interior groove and aplurality of cutaway portions or notches,and an escutcheon plate having fingers or engaging surfaces to passthrough said notches lnto the groove and then be rotated slightly,either by hand or by the bolt used with the expansion.

Our invention further relates to certain combinations, details ofconstruction, and articles of manufacture, which will be more fullyhereinafter described and pointed out in the claims.

In the accompanying drawings the same reference numerals refer tosimilar parts in the several figures.

Fig. 1 is a vertical section through a ceiling or other suitablesupport, showing our expansion bolt partly brokenaway for purposes ofclearer illustration;

Specification of Letters Patent.

Application filed. April 2, 1921.

Patented May 23, 1922.

Serial No. 458,081.

Fig. 2 is a plan view of the interior surface of the escutcheon plate;

Fig. 3 is a side elevation of the escutcheon plate;

Fig. 4: is an end elevation of this expansion;

Fig. 5 is an eniil elevation of the combined expansion and escutcheonplate, showing the first attaching position, wherein the escutcheonplate is eccentric with relation to the longitudinal axis of theexpansion;

Fig. 6 is an end elevation, similar to Fig. 5, showing the escutcheonplate partially rotated frointhe position shown in Fig. 5, so as to makeit concentric with the longitudinal axis of the expansion.

It has been proposed to secure a ren1ovable cap or plate to an expansionbolt, the head of which is permitted to ex end out of the opening in thewall or ceiling a sufficient distance to become imbedded or seated in,and enclosed by, a hollow removable plate. Among other disadvantagesthis is objectionable in that the expansion is not iii--- serted itsfulllength in the hole and there fore its effective expansion surface ismaterially lessened. To carry a. given load a larger expansion isrequired than one in which the expansion bolt proper is inserted for itswhole length within the hole. It is further objectionable in that itbrings a powerful expansion force near the outer sur face of the wall orceiling which is apt to cause the surface or wall to crack around thehole, requiring a larger plate than if the expansion force was thrownwell back into the hole and removed from the surface of the wall orceiling.

By our invention we permit the full length of the expansion to beinserted in the wall, ceiling or other suitable support, and

therefore insure that the powerful expansion is exerted well back fromthe surface of the wall or ceiling, thereby insuring both a strongerexpansion for a given size of expansion bolt, and also protecting thesurface of the wall or ceiling from cracking or crumbling as theexpansion force is apsuch. an arrangement in 4-. tioning theescutcheonplate 13 the finger 15 plied to the expansion bolt. Thispermits us to use an escutcheon plate of the minimum size and thereforeone requiring less metal and cheaper to manufacture. Being relativelysmall it is less obtrusive and enhances the appearance of the job.

In the drawings we have shown one embodiment of our invention in which 1is any suitable expension, having interior loa'king surfaces :2,preferably formed as a groove in the neck 3. We have shown for purposesof illustration the expansion 1 as a machine expansion formed of the twoparts 1 and 5 which are forced apart by the wedge 6 carried by the nut 7the nut being provided with interior screw threads to cooperate with themale threads upon the bolt 8. The members 4 and 5 are also preferably,though not necessarily, provided with parallel ribs 9, 9 to engage withthe walls ofthe hole 10 in the ceiling or other support 12. The form ofthe expansion is immaterial for it may be operated by a machine bolt, alag screwor any other suitable means. It must, however, be provided witha neck such for example as 3, in which engaging lor-hingsurfaces areformed. I

The escutcheon plate 18 is provided with locking means to cooperate withthe expansion 1 so that in the first attaching position the parts willnot be concentric; that is, the center of the escutcheon plate 13 willnot at first be concentric with the longitudinal axis of theexpansion 1. By rotating the es cutcheon plate, with relation to theexpansion, the parts will be brought into concentric relation with eachother. They are held in concentric relation by means of the bolt so thatthey cannot be removed, one from the other, as long as the bolt isconnected with the expansion. The escutcheon plate may be partiallyrotated by hand or by the mere insertion of the bolt 8.

Various means may be employed tov accomplish this, all of which comewithin the terms of our invention. e have shown by way of example onesuch arrangement, but of course it is to be understood that ourinvention is not to be limited to the par ticular construction shown.lVe provide the escutcheon plate 13 with the fingers 1-1- and 15 whichare shown in Fig. 2 as being 180 degrees apart. The neck 3 of theexpansion is provided with the cutaway portions or notches 16 and 17,Fig. 1, so arranged that when the fingers 1 1 and 15 are brought0pposite to their respective notches 16 and 17 the center of theescutcheon plate will be out of line, or eccentric with the longitudinalaxis of the bolt anchor 1. We have shown Infir'st posiis. brought inline with thenotch 16 and the finger 14 in line with the notch 17 andthen pressed in slightly until the ends of the fingers reach the groove2 in the necl: 3. The parts are then eccentric, as shown in Fig. 5. Theescutcheon plate is then rotated slightly so as to cause the end of thefinger 14 to engage behind the shoulder 18, as shown in Figs 1 and 6.This rotation may be by hand or by merely inserting the bolt 8. In thisposition the parts are concentric and are heldconcentric by the bolt 8.They cannot be brought back into the eccentric position shown in Fig. 5,preparatory to dis connecting the escutcheon plate from the expansion,as long as the bolt 8 is in the ex pansion. When,. however, the bolt 8has been withdrawn it is a comparatively simple matter to bring theparts into the eccentrio position shown in. Fig. 5, and disconnect theescutcheon plate from the expansion, should this be desirable at anytime.

Our invention is. adapted for universal use and is particularly usefulin hanging pipes to ceilings and walls, as for example, in automaticfire sprinkling installations. The pipes are supported by the bolt 8..By the use of our invention we not only reduce the cost of installation,but insure a stronger grin for an expansion bolt of a given size andalsoinsure a more finished and better artistic effect for the entireinstallation.

Having thus described this invention in connection with an illustrativeembodiment thereof, to the details of which we do not desire to belimited,what isclaimed as new and what is desired to secure by LettersPatent is set forth in the appended claims.

What we claim is 1. The combination of an expansion bolt having a neckprovided with an interior groove, said groove having notches arranged atless than 180 apart adapted to receive the concentric lugsof anescutcheon plate.

2. An expansion bolt comprising a shield having internal lockingsurfaces to cooperate with an escutcheon plate, an escutcheon platehaving concentric locking surfaces to enter the locking surfaces of theshield eccentrically, a bolt to locate the escutcheon plate and itsconcentric bearing surfaces concentrically with the longitudinal axis ofthe shield thereby preventing detachment of the escutcheon plate fromthe shield.

3. The combination of an expansion shield having a neck provided with aninterior groove with slots extending from the extremity of the shieldinto the groove, said slots arranged at less than 180 apart,anescutcheon plate provided with concentric lugs to engage said groove andmeans to held the concentric lugs on the escutcheon plate concentricwith the axis of the shield to prevent-its extraction in an eccentricposition through the. slots.

4. The combination of an expansion bolt and an escutcheon plate bothhaving coopthe locking means from the eccentric lookerating lockingmeans whereby they may be ing position to the concentric lockingposimade to engage in eccentric position and. tion. then be locked byrotating to concentric position. i

5. The combination. of an expansion bolt HENRY W. PLEISTER. J OHNKARITZKY.

and an escutcheon plate both having coop- Witnesses:

erating locking means whereby they may be M. R. RYAN, made to engage ineccentric position and E. J. ROTH, then be locked by rotating toconcentric po- WILLIAM NEILL, sition, a bolt, said bolt adapted to bringF. W. KARITZKY.

